| 1. | Summit County, UT (Park City, Summit Park, Snyderville) (pop. 29,736) | 4.00 |
| 2. | Douglas County, CO (Highlands Ranch, Parker, Castle Rock) (pop. 175,766) | 3.94 |
| 3. | Howard County, MD (Columbia, Ellicott City, Scaggsville) (pop. 247,842) | 3.85 |
| 4. | Gallatin County, MT (Bozeman, Belgrade, Gallatin Gateway) (pop. 67,831) | 3.84 |
| 5. | Hunterdon County, NJ (Flemington, Lambertville, High Bridge) (pop. 121,989) | 3.83 |
| 6. | Montgomery County, MD (Silver Spring, Wheaton-Glenmont, Germantown) (pop. 873,341) | 3.83 |
| 7. | Boulder County, CO (Boulder, Longmont, Lafayette) (pop. 291,288) | 3.83 |
| 8. | Chittenden County, VT (Burlington, Essex, Colchester) (pop. 146,571) | 3.81 |
| 9. | Johnson County, KS (Overland Park, Olathe, Shawnee) (pop. 451,086) | 3.80 |
| 10. | Orange County, NC (Chapel Hill, Carrboro, Hillsborough) (pop. 118,227) | 3.79 |
| 11. | Middlesex County, CT (Middletown, Cromwell, Old Saybrook) (pop. 155,071) | 3.77 |
| 12. | Morris County, NJ (Morristown, Dover, Madison) (pop. 470,212) | 3.77 |
| 13. | Norfolk County, MA (Quincy, Brookline, Weymouth) (pop. 650,308) | 3.76 |
| 14. | Rockingham County, NH (Salem, Derry, Portsmouth) (pop. 277,359) | 3.75 |
| 15. | Dakota County, MN (Eagan, Burnsville, Apple Valley) (pop. 355,904) | 3.75 |
| 16. | Somerset County, NJ (Somerset, North Plainfield, Bradley Gardens) (pop. 297,490) | 3.75 |
| 17. | Washington County, RI (South Kingstown, North Kingstown, Westerly) (pop. 123,546) | 3.74 |
| 18. | Fairfield County, CT (Bridgeport, Stamford, Norwalk) (pop. 882,567) | 3.74 |
| 19. | Tolland County, CT (Vernon, Mansfield, Tolland) (pop. 136,364) | 3.74 |
| 20. | District of Columbia, DC (Washington) (pop. 572,059) | 3.74 |
| 21. | Wasatch County, UT (Heber, Midway, Daniel) (pop. 15,215) | 3.74 |
| 22. | Jefferson County, CO (Northeast Jefferson, Lakewood, Arvada) (pop. 527,056) | 3.74 |
| 23. | Cobb County, GA (Northeast Cobb, Marietta, Smyrna) (pop. 607,751) | 3.74 |
| 24. | Teller County, CO (Divide, Woodland Park, Cripple Creek) (pop. 20,555) | 3.74 |
| 25. | DuPage County, IL (Naperville, Wheaton, Downers Grove) (pop. 904,161) | 3.73 |
| 26. | San Mateo County, CA (Daly City, San Mateo, Redwood City) (pop. 707,161) | 3.73 |
| 27. | Gwinnett County, GA (Dacula-Rocky Creek, Lawrenceville, Duluth) (pop. 588,448) | 3.73 |
| 28. | Hennepin County, MN (Minneapolis, Bloomington, Brooklyn Park) (pop. 1,116,200) | 3.72 |
| 29. | Santa Clara County, CA (San Jose, Sunnyvale, Santa Clara) (pop. 1,682,585) | 3.71 |
| 30. | Cumberland County, ME (Portland, South Portland, Westbrook) (pop. 265,612) | 3.71 |
| 31. | Wake County, NC (Raleigh, Cary, Apex) (pop. 627,846) | 3.70 |
| 32. | Westchester County, NY (Yonkers, Greenburgh, New Rochelle) (pop. 923,459) | 3.70 |
| 33. | Newport County, RI (Newport, Middletown, Portsmouth) (pop. 85,433) | 3.70 |
| 34. | Barnstable County, MA (Barnstable Town, Yarmouth, Mashpee) (pop. 222,230) | 3.70 |
| 35. | Grafton County, NH (Lebanon, Hanover, Littleton) (pop. 81,743) | 3.70 |
| 36. | Larimer County, CO (Fort Collins, Loveland, Estes Park) (pop. 251,494) | 3.70 |
| 37. | Merrimack County, NH (Concord, Franklin, Bow) (pop. 136,225) | 3.70 |
| 38. | Sarpy County, NE (Bellevue, Papillion, La Vista) (pop. 122,595) | 3.69 |
| 39. | Bristol County, RI (Bristol, Barrington, Warren) (pop. 50,648) | 3.69 |
| 40. | Fulton County, GA (Atlanta, Sandy Springs, Roswell) (pop. 816,006) | 3.69 |
| 41. | Monmouth County, NJ (Long Branch, Asbury Park, Tinton Falls) (pop. 615,301) | 3.69 |
| 42. | Lake County, IL (Waukegan, North Chicago, Highland Park) (pop. 644,356) | 3.69 |
| 43. | Ada County, ID (Boise, Meridian, Orchard) (pop. 300,904) | 3.69 |
| 44. | Davis County, UT (North Davis, South Davis, Layton) (pop. 238,994) | 3.69 |
| 45. | Douglas County, KS (Lawrence, Eudora, Baldwin City) (pop. 99,962) | 3.69 |
| 46. | Hampshire County, MA (Amherst, Northampton, South Hadley) (pop. 152,251) | 3.69 |
| 47. | Arapahoe County, CO (South Aurora, Southwest Arapahoe, Centennial) (pop. 487,967) | 3.69 |
| 48. | Frederick County, MD (Frederick, Ballenger Creek, Linganore-Bartonsville) (pop. 195,277) | 3.68 |
| 49. | Beaufort County, SC (Hilton Head Island, St. Helena, Beaufort) (pop. 120,937) | 3.68 |
| 50. | Bergen County, NJ (Hackensack, Teaneck, Fort Lee) (pop. 884,118) | 3.68 |
| 51. | El Paso County, CO (Colorado Springs, Black Forest-Peyton, Security-Widefield) (pop. 516,929) | 3.68 |
| 52. | Hillsborough County, NH (Manchester, Nashua, Merrimack) (pop. 380,841) | 3.68 |
| 53. | Plymouth County, MA (Brockton, Wareham, Middleborough) (pop. 472,822) | 3.68 |
| 54. | Utah County, UT (Provo, Orem, Pleasant Grove) (pop. 368,536) | 3.68 |
| 55. | Cass County, ND (Fargo, West Fargo, Casselton) (pop. 123,138) | 3.68 |
| 56. | Middlesex County, MA (Lowell, Cambridge, Newton) (pop. 1,465,396) | 3.67 |
| 57. | King County, WA (Seattle, East Seattle, Bellevue) (pop. 1,737,034) | 3.67 |
| 58. | Washington County, VT (Barre, Montpelier, Northfield) (pop. 58,039) | 3.67 |
| 59. | Anne Arundel County, MD (Glen Burnie, Annapolis, Severn) (pop. 489,656) | 3.67 |
| 60. | Montgomery County, PA (Norristown, Pottstown, King of Prussia) (pop. 750,097) | 3.67 |
| 61. | Windsor County, VT (Hartford, Springfield, Windsor) (pop. 57,418) | 3.66 |
| 62. | Washington County, OR (Beaverton, Hillsboro, Somerset West-Rock Creek) (pop. 445,342) | 3.66 |
| 63. | Williamson County, TX (Round Rock, Georgetown, Cedar Park) (pop. 249,967) | 3.66 |
| 64. | Santa Fe County, NM (Santa Fe, Eldorado at Santa Fe, La Cienega) (pop. 129,292) | 3.66 |
| 65. | Cheshire County, NH (Keene, Swanzey, Rindge) (pop. 73,825) | 3.66 |
| 66. | Riley County, KS (Manhattan, Fort Riley North, Ogden) (pop. 62,843) | 3.66 |
| 67. | Carroll County, MD (Eldersburg, Westminster, District 1, Taneytown) (pop. 150,897) | 3.65 |
| 68. | Fairbanks North Star Borough, AK (Fairbanks, Badger, College) (pop. 82,840) | 3.65 |
| 69. | Nassau County, NY (North Hempstead, Hempstead, Levittown) (pop. 1,334,544) | 3.65 |
| 70. | Missoula County, MT (Missoula, Orchard Homes, Seeley Lake-Blackfoot Valley) (pop. 95,802) | 3.65 |
| 71. | Orange County, CA (North Coast, Santa Ana, Anaheim) (pop. 2,846,289) | 3.65 |
| 72. | Anchorage Municipality, AK (Anchorage) (pop. 260,283) | 3.65 |
| 73. | Orange County, VT (Randolph, Williamstown, Thetford) (pop. 28,226) | 3.65 |
| 74. | New York County, NY (New York, Manhattan) (pop. 1,537,195) | 3.64 |
| 75. | New Castle County, DE (Brandywine, Wilmington, Greater Newark) (pop. 500,265) | 3.64 |
| 76. | Contra Costa County, CA (Central Contra Costa, West Contra Costa, Concord) (pop. 948,816) | 3.64 |
| 77. | York County, ME (Biddeford, Saco, York) (pop. 186,742) | 3.64 |
| 78. | Mecklenburg County, NC (Charlotte, Huntersville, Matthews) (pop. 695,454) | 3.64 |
| 79. | Kootenai County, ID (Coeur d'Alene, Post Falls, Hayden) (pop. 108,685) | 3.64 |
| 80. | Sagadahoc County, ME (Bath, Topsham, Woolwich) (pop. 35,214) | 3.64 |
| 81. | Harford County, MD (Bel Air South, Bel Air North, Edgewood) (pop. 218,590) | 3.64 |
| 82. | Ramsey County, MN (St. Paul, Maplewood, Roseville) (pop. 511,035) | 3.64 |
| 83. | Alameda County, CA (Oakland, Fremont, Hayward) (pop. 1,443,741) | 3.63 |
| 84. | Prince George's County, MD (Bowie, Oxon Hill-Glassmanor, Chillum) (pop. 801,515) | 3.63 |
| 85. | Salt Lake County, UT (Salt Lake City, West Valley City, Sandy) (pop. 898,387) | 3.63 |
| 86. | Burlington County, NJ (Moorestown-Lenola, Franklin Park, Browns Mills) (pop. 423,394) | 3.63 |
| 87. | Lancaster County, NE (Lincoln, Waverly, Hickman) (pop. 250,291) | 3.63 |
| 88. | Franklin County, MA (Greenfield Town, Greenfield, Montague) (pop. 71,535) | 3.63 |
| 89. | San Diego County, CA (San Diego, Chula Vista, Oceanside) (pop. 2,813,833) | 3.63 |
| 90. | Charles County, MD (St. Charles, Waldorf, District 8, Bryantown) (pop. 120,546) | 3.63 |
| 91. | Sussex County, NJ (Hopatcong, Lake Mohawk, Newton) (pop. 144,166) | 3.62 |
| 92. | Polk County, IA (Des Moines, West Des Moines, Urbandale) (pop. 374,601) | 3.62 |
| 93. | Hartford County, CT (Hartford, New Britain, West Hartford) (pop. 857,183) | 3.62 |
| 94. | Suffolk County, NY (Brentwood, West Babylon, Commack) (pop. 1,419,369) | 3.61 |
| 95. | New London County, CT (Norwich, New London, Waterford) (pop. 259,088) | 3.61 |
| 96. | Burleigh County, ND (Bismarck, Lincoln, Wing) (pop. 69,416) | 3.61 |
| 97. | Clackamas County, OR (Northwest Clackamas, Lake Oswego, Oregon City) (pop. 338,391) | 3.61 |
| 98. | Minnehaha County, SD (Sioux Falls, Brandon, Dell Rapids) (pop. 148,281) | 3.61 |
| 99. | DeKalb County, GA (North Atlanta, Redan, Dunwoody) (pop. 665,865) | 3.61 |
| 100. | Douglas County, NE (Omaha, Ralston, Elkhorn) (pop. 463,585) | 3.61 |
| 101. | Fort Bend County, TX (Sugar Land, Missouri City, Mission Bend) (pop. 354,452) | 3.61 |